aave-protocol-v2/test-suites/test-aave/helpers/utils/ray-math/bignumber.ts

import BigNumber from 'bignumber.js';
import { BigNumber as BigNumberEthers, BigNumberish } from 'ethers';

export type BigNumberValue = string | number | BigNumber | BigNumberEthers | BigNumberish;

export const BigNumberZD = BigNumber.clone({
  DECIMAL_PLACES: 0,
  ROUNDING_MODE: BigNumber.ROUND_DOWN,
});

export function valueToBigNumber(amount: BigNumberValue): BigNumber {
  return new BigNumber(amount.toString());
}
export function valueToZDBigNumber(amount: BigNumberValue): BigNumber {
  return new BigNumberZD(amount.toString());
}

export function ethersValueToZDBigNumber(amount: BigNumberEthers): BigNumber {
  return new BigNumberZD('0x' + amount.toHexString());
}